Sökning: "perovskites"

Visar resultat 1 - 5 av 30 avhandlingar innehållade ordet perovskites.

  1. 1. Vibrational proton dynamics in hydrated perovskites and alkali thio-hydroxogermanates

    Författare :Maths Karlsson; [2005]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; fuel cell; proton conduction; perovskites; proton dynamics; thio-hydroxogermanates; vibrational spectroscopy;

    Sammanfattning : .... LÄS MER

  2. 2. Functional Oxide Materials exhibiting Ionic Conductivity for Future Energy Conversion Needs

    Författare :FRANCIS GACHAO KINYANJUI; [2013]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; neutron diffraction; perovskites; oxygen deficient perovskites; BaSnO3; Rietveld refinements; BaZrO3; in-situ cells; proton conduction; deuteron position; Ba3In2ZrO8;

    Sammanfattning : Fuel cells are electrochemical devices that transform the chemical energy in hydrogen and oxygen into electrical energy at high efficiencies and produce only water vapour emissions. Materials with the perovskite or fluorite structure types are commonly employed as the ion conducting ceramic electrolyte membranes in intermediate and high temperature fuel cells. LÄS MER

  3. 3. Neutron scattering for sustainable energy materials: investigations of proton dynamics in acceptor doped barium zirconates

    Detta är en avhandling från ; Chalmers tekniska högskola; Gothenburg

    Författare :Daria Noferini; [2018]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; neutron scattering; fuel cells; QENS; Proton conductors; perovskites; proton dynamics; energy materials;

    Sammanfattning : Proton conducting oxides are currently receiving considerable attention for their present or potential use as electrolytes in technological devices such as sensors and electrolysers and, in particular, solid oxide fuel cells, which are among the most promising apparatuses for energy conversion. One of the main challenges for these latter devices is to combine the advantages of a solid electrolyte with those of operational temperatures below 750 °C, which is currently hampered by insufficient conductivities in the targeted temperature range. LÄS MER

  4. 4. Proton Conducting Ceramics; Synthesis, Characterization and Sample Cell Environments

    Detta är en avhandling från ; Chalmers tekniska högskola; Gothenburg

    Författare :FRANCIS GACHAO KINYANJUI; [2012]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; perovskites; neutron diffraction; Rietveld refinements; BaSnO3; in-situ cell; deuteron position; proton conduction; BaZrO3;

    Sammanfattning : Acceptor doped Perovskite ceramics have been shown to exhibit high levels of protonic conduction in humid atmospheres. However significant grain boundary resistance and long sintering times required to achieve sufficient grain size growth has hindered their widespread application as electrolyzers, fuel cells and gas separation membranes. LÄS MER

  5. 5. Super-resolution Luminescence Micro-Spectroscopy : A nano-scale view of solar cell material photophysics

    Detta är en avhandling från Lund University, Faculty of Science, Department of Chemistry, Division of Chemical Physics

    Författare :Aboma Merdasa; Lund University.; Lunds universitet.; [2017-01]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; super-resolution microscopy; Single Molecule Spectroscopy; J-aggregates; perovskites; photophysics;

    Sammanfattning : Optical microscopy is a fundamental tool in a range of disciplines encompassed by the physical and biological sciences. At the dawn of this millennium, a break-through was made in optical microscopy where super-resolution methods emerged and declared imaging beyond the optical diffraction limit a possibility. LÄS MER